A broken foot, usually referred to as an ankle sprain, can usually be sprayed with Yunnan Baiyao aerosol after 72 hours, which functions to activate blood circulation and remove blood stasis, reduce swelling and relieve pain. Seventy-two hours after the injury, usually bleeding stopped, swelling is also stabilized, you can spray Yunnan Baiyao aerosol, with the function of reducing swelling, activating blood circulation and removing blood stasis. It is important to note that a very small number of people may develop allergic rashes after using the drug, appearing as itchy all over the body, hives on the trunk and limbs and other parts of the body, which can usually disappear after stopping the drug. Therefore, it is recommended to use the above drugs under the guidance of a doctor. In short, Yunnan Baiyao has the effect of reducing swelling and pain, can be used as an emergency medicine in the recovery period of the ankle, but is not suitable for long-term use. In addition, do not apply hot compresses to the affected area when you have just broken your foot, so as not to aggravate the bleeding. It is recommended to go to the hospital in time after accidentally breaking the foot, under the guidance of the doctor for treatment.